org.jruby.ext.ripper.StringTerm Maven / Gradle / Ivy
/***** BEGIN LICENSE BLOCK *****
* Version: CPL 1.0/GPL 2.0/LGPL 2.1
*
* The contents of this file are subject to the Common Public
* License Version 1.0 (the "License"); you may not use this file
* except in compliance with the License. You may obtain a copy of
* the License at http://www.eclipse.org/legal/cpl-v10.html
*
* Software distributed under the License is distributed on an "AS
* IS" basis, WITHOUT WARRANTY OF ANY KIND, either express or
* implied. See the License for the specific language governing
* rights and limitations under the License.
*
* Copyright (C) 2013 The JRuby Team ([email protected])
*
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* either of the GNU General Public License Version 2 or later (the "GPL"),
* or the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
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package org.jruby.ext.ripper;
import java.io.IOException;
import org.jcodings.Encoding;
import org.jruby.ext.ripper.SyntaxException.PID;
import org.jruby.parser.Tokens;
import org.jruby.util.ByteList;
public class StringTerm extends StrTerm {
// Expand variables, Indentation of final marker
private int flags;
// Start of string ([, (, {, <, ', ", \n)
private final char begin;
// End of string (], ), }, >, ', ", \0)
private final char end;
// How many strings are nested in the current string term
private int nest;
public StringTerm(int flags, int begin, int end) {
this.flags = flags;
this.begin = (char) begin;
this.end = (char) end;
this.nest = 0;
}
protected ByteList createByteList(RipperLexer lexer) {
return new ByteList(new byte[]{}, lexer.getEncoding());
}
private int endFound(RipperLexer lexer, LexerSource src, ByteList buffer) throws IOException {
if ((flags & RipperLexer.STR_FUNC_QWORDS) != 0) {
flags = -1;
lexer.getPosition();
buffer.append(end);
lexer.setValue(new Token(buffer, lexer.getPosition()));
return ' ';
}
if ((flags & RipperLexer.STR_FUNC_REGEXP) != 0) {
String options = parseRegexpFlags(lexer, src);
buffer.append(options.getBytes());
lexer.setValue(new Token(buffer, lexer.getPosition()));
return Tokens.tREGEXP_END;
}
buffer.append(end);
lexer.setValue(new Token(buffer, lexer.getPosition()));
return Tokens.tSTRING_END;
}
@Override
public int parseString(RipperLexer lexer, LexerSource src) throws IOException {
boolean spaceSeen = false;
int c;
// FIXME: How much more obtuse can this be?
// Heredoc already parsed this and saved string...Do not parse..just return
if (flags == -1) {
lexer.setValue(new Token("" + end, lexer.getPosition()));
lexer.ignoreNextScanEvent = true;
return Tokens.tSTRING_END;
}
ByteList buffer = createByteList(lexer);
c = src.read();
if ((flags & RipperLexer.STR_FUNC_QWORDS) != 0 && Character.isWhitespace(c)) {
do {
buffer.append((char) c);
c = src.read();
} while (Character.isWhitespace(c));
spaceSeen = true;
}
if (c == end && nest == 0) {
return endFound(lexer, src, buffer);
}
if (spaceSeen) {
src.unread(c);
lexer.getPosition();
lexer.setValue(new Token(buffer, lexer.getPosition()));
return ' ';
}
if ((flags & RipperLexer.STR_FUNC_EXPAND) != 0 && c == '#') {
c = src.read();
switch (c) {
case '$':
case '@':
src.unread(c);
lexer.setValue(new Token("#", lexer.getPosition()));
return Tokens.tSTRING_DVAR;
case '{':
lexer.setValue(new Token("#{", lexer.getPosition()));
return Tokens.tSTRING_DBEG;
}
buffer.append((byte) '#');
}
src.unread(c);
if (parseStringIntoBuffer(lexer, src, buffer) == RipperLexer.EOF) {
throw new SyntaxException(PID.STRING_HITS_EOF, lexer.getPosition(),
src.getCurrentLine(), "unterminated string meets end of file");
}
lexer.setValue(lexer.createStr(lexer.getPosition(), buffer, flags));
return Tokens.tSTRING_CONTENT;
}
private String parseRegexpFlags(RipperLexer lexer, LexerSource src) throws IOException {
StringBuilder buf = new StringBuilder(""+end);
int c;
StringBuilder unknownFlags = new StringBuilder(10);
for (c = src.read(); c != RipperLexer.EOF
&& Character.isLetter(c); c = src.read()) {
switch (c) {
case 'i': case 'x': case 'm': case 'o': case 'n':
case 'e': case 's': case 'u':
buf.append((char) c);
break;
default:
unknownFlags.append((char) c);
break;
}
}
src.unread(c);
if (unknownFlags.length() != 0) {
throw new SyntaxException(PID.REGEXP_UNKNOWN_OPTION, lexer.getPosition(), "unknown regexp option"
+ (unknownFlags.length() > 1 ? "s" : "") + " - "
+ unknownFlags.toString(), unknownFlags.toString());
}
return buf.toString();
}
private void mixedEscape(RipperLexer lexer, Encoding foundEncoding, Encoding parserEncoding) {
throw new SyntaxException(PID.MIXED_ENCODING,lexer.getPosition(), "",
foundEncoding + " mixed within " + parserEncoding);
}
// mri: parser_tokadd_string
public int parseStringIntoBuffer(RipperLexer lexer, LexerSource src, ByteList buffer) throws IOException {
boolean qwords = (flags & RipperLexer.STR_FUNC_QWORDS) != 0;
boolean expand = (flags & RipperLexer.STR_FUNC_EXPAND) != 0;
boolean escape = (flags & RipperLexer.STR_FUNC_ESCAPE) != 0;
boolean regexp = (flags & RipperLexer.STR_FUNC_REGEXP) != 0;
boolean symbol = (flags & RipperLexer.STR_FUNC_SYMBOL) != 0;
boolean hasNonAscii = false;
int c;
Encoding encoding = lexer.getEncoding();
while ((c = src.read()) != RipperLexer.EOF) {
if (begin != '\0' && c == begin) {
nest++;
} else if (c == end) {
if (nest == 0) {
src.unread(c);
break;
}
nest--;
} else if (expand && c == '#' && !src.peek('\n')) {
int c2 = src.read();
if (c2 == '$' || c2 == '@' || c2 == '{') {
src.unread(c2);
src.unread(c);
break;
}
src.unread(c2);
} else if (c == '\\') {
c = src.read();
switch (c) {
case '\n':
if (qwords) break;
if (expand) continue;
buffer.append('\\');
break;
case '\\':
if (escape) buffer.append(c);
break;
case 'u':
if (!expand) {
buffer.append('\\');
break;
}
if (regexp) {
lexer.readUTFEscapeRegexpLiteral(buffer);
} else {
lexer.readUTFEscape(buffer, true, symbol);
}
if (hasNonAscii && buffer.getEncoding() != encoding) {
mixedEscape(lexer, buffer.getEncoding(), encoding);
}
continue;
default:
if (regexp) {
src.unread(c);
parseEscapeIntoBuffer(lexer, src, buffer);
if (hasNonAscii && buffer.getEncoding() != encoding) {
mixedEscape(lexer, buffer.getEncoding(), encoding);
}
continue;
} else if (expand) {
src.unread(c);
if (escape) buffer.append('\\');
c = lexer.readEscape();
} else if (qwords && Character.isWhitespace(c)) {
/* ignore backslashed spaces in %w */
} else if (c != end && !(begin != '\0' && c == begin)) {
buffer.append('\\');
}
}
} else if (!Encoding.isAscii((byte) c)) {
if (buffer.getEncoding() != encoding) {
mixedEscape(lexer, buffer.getEncoding(), encoding);
}
c = src.readCodepoint(c, encoding);
if (c == -2) { // FIXME: Hack
throw new SyntaxException(PID.INVALID_MULTIBYTE_CHAR, lexer.getPosition(),
null, "invalid multibyte char (" + encoding + ")");
}
// FIXME: We basically go from bytes to codepoint back to bytes to append them...fix this
if (lexer.tokenAddMBC(c, buffer) == RipperLexer.EOF) return RipperLexer.EOF;
continue;
} else if (qwords && Character.isWhitespace(c)) {
src.unread(c);
break;
}
// Hmm did they change this?
/* if (c == '\0' && symbol) {
throw new SyntaxException(PID.NUL_IN_SYMBOL, lexer.getPosition(),
src.getCurrentLine(), "symbol cannot contain '\\0'");
* } else*/
if ((c & 0x80) != 0) {
hasNonAscii = true;
if (buffer.getEncoding() != encoding) {
mixedEscape(lexer, buffer.getEncoding(), encoding);
}
}
buffer.append(c);
}
return c;
}
// Was a goto in original ruby lexer
private void escaped(RipperLexer lexer, LexerSource src, ByteList buffer) throws java.io.IOException {
int c;
switch (c = src.read()) {
case '\\':
parseEscapeIntoBuffer(lexer, src, buffer);
break;
case RipperLexer.EOF:
throw new SyntaxException(PID.INVALID_ESCAPE_SYNTAX, lexer.getPosition(),
src.getCurrentLine(), "Invalid escape character syntax");
default:
buffer.append(c);
}
}
private void parseEscapeIntoBuffer(RipperLexer lexer, LexerSource src, ByteList buffer) throws java.io.IOException {
int c;
switch (c = src.read()) {
case '\n':
break; /* just ignore */
case '0':
case '1':
case '2':
case '3': /* octal constant */
case '4':
case '5':
case '6':
case '7':
buffer.append('\\');
buffer.append(c);
for (int i = 0; i < 2; i++) {
c = src.read();
if (c == RipperLexer.EOF) {
throw new SyntaxException(PID.INVALID_ESCAPE_SYNTAX, lexer.getPosition(),
src.getCurrentLine(), "Invalid escape character syntax");
}
if (!RipperLexer.isOctChar(c)) {
src.unread(c);
break;
}
buffer.append(c);
}
break;
case 'x': /* hex constant */
buffer.append('\\');
buffer.append(c);
c = src.read();
if (!RipperLexer.isHexChar(c)) {
throw new SyntaxException(PID.INVALID_ESCAPE_SYNTAX, lexer.getPosition(),
src.getCurrentLine(), "Invalid escape character syntax");
}
buffer.append(c);
c = src.read();
if (RipperLexer.isHexChar(c)) {
buffer.append(c);
} else {
src.unread(c);
}
break;
case 'M':
if ((c = src.read()) != '-') {
throw new SyntaxException(PID.INVALID_ESCAPE_SYNTAX, lexer.getPosition(),
src.getCurrentLine(), "Invalid escape character syntax");
}
buffer.append(new byte[] { '\\', 'M', '-' });
escaped(lexer, src, buffer);
break;
case 'C':
if ((c = src.read()) != '-') {
throw new SyntaxException(PID.INVALID_ESCAPE_SYNTAX, lexer.getPosition(),
src.getCurrentLine(), "Invalid escape character syntax");
}
buffer.append(new byte[] { '\\', 'C', '-' });
escaped(lexer, src, buffer);
break;
case 'c':
buffer.append(new byte[] { '\\', 'c' });
escaped(lexer, src, buffer);
break;
case RipperLexer.EOF:
throw new SyntaxException(PID.INVALID_ESCAPE_SYNTAX, lexer.getPosition(),
src.getCurrentLine(), "Invalid escape character syntax");
default:
if (c != '\\' || c != end) {
buffer.append('\\');
}
buffer.append(c);
}
}
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